httpRuntime 加 maxRequestLength 沒作用, 請到 system.webServer 設定 maxAllowedContentLength
<system.webServer>
...
<security>
<requestFiltering>
<!--1073741824 ==> 1GB-->
<requestLimits maxAllowedContentLength="1073741824" />
</requestFiltering>
</security>
...
</system.webServer>